.card-header{
    height: 45px;
}
.card-body span {
    font-size: 12px;
    color: #888;
}
.card-body{
    color: #2d3436;
}
.card-footer{
    display: flex;
    justify-content: space-between;
    color: #1890ff;
    margin-top: 10px;
}
.exp-join:hover{
    cursor: pointer;
}
.stu-header{
    display: flex;
    align-items: center;
    justify-content: space-between;
}